FILE - This undated file photo provided by the Chicago Police Department shows 25-year-old Donnell Flora. Flora was charged in connection in the April 28, 2014 slaying of 14-year-old Endia Martin of Chicago who police say was shot in the back by another 14-year-old during an argument over a boy. Flora, who is Martin's uncle, is accused of providing the gun and accompanying the suspected shooter to the fight. The killing is another that keeps Chicago at the epicenter of the national debate about gun violence. (AP Photo/Chicago Police Department, File) (The Associated Press)

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In this Thursday, June 5, 2014 photo, Larry Martin, pastor at Hope Church of Chicago stands inside the chapel at a Salvation Army facility in Chicago. Martin, a minister and friend to the family of 14-year-old Endia Martin, who was fatally shot last April 28 allegedly by another 14-year-old girl in what started as a war of words on Facebook over a boy, eulogized the girl at her funeral on May 5. When she died, Endia Martin, a vibrant girl who wanted to be a nurse, became the latest symbol of the cost of gun violence in the city. (AP Photo/Stacy Thacker) (The Associated Press)

CHICAGO – A 14-year-old girl's appearance in court on a murder charge highlights the problem of gun violence plaguing Chicago.

Friday's hearing for the girl in juvenile court will be the latest chapter in a story that began April 28, when the teen allegedly shot and killed 14-year-old Endia Martin in what police say was a fight over a boy.

With allegations that a 25-year-old uncle who has used a wheelchair since he was shot in what police say was a gang-related shooting brought the teen a gun at her request, the case also underscores just how entrenched violence is in some pockets of Chicago.

Police Superintendent Garry McCarthy says it illustrates a "cycle of violence." The number of slayings fell last year but Chicago still leads the nation in homicides.